diff --git a/CHANGELOG.md b/CHANGELOG.md
index c835e36f..e25b7aec 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,10 @@
 ChangeLog
 =========
 
+4.20.0 (2022-12-23)
+-------------------
+* #74 Handle null tzid
+
 4.19.0 (2022-12-21)
 -------------------
 * #72 Deprecate Enderbury timezone
diff --git a/lib/Version.php b/lib/Version.php
index 132d98cf..1eed7a28 100644
--- a/lib/Version.php
+++ b/lib/Version.php
@@ -14,5 +14,5 @@ class Version
     /**
      * Full version number.
      */
-    const VERSION = '4.19.0';
+    const VERSION = '4.20.0';
 }